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DOI : , Vol.19, No.3, 29 ~ 37, 2011
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| Title |
| Nitrification, Denitrification and Nitrogen Mass Balance according to SRT and C/N ratio in Intermittently Aerated Membrane Bioreactor(IAMBR) |
| 이준명 Jun Myeong Lee , 최창규 Chang Kyoo Choi , 이광호 Kwang Ho Lee |
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| Abstract |
| The purpose of this study was to find out the mass balance of the nitrgen removal, as it investigated the rate of nitrification and denitrification. The operation conditions were SRT of 20, 25, 30 and 40days at first stage and C/N ratios of 4.5, 7 and 10 at second stage. In the results to be operated at SRT variation, the rate of nitrification and denitrification was a little difference among SRT conditions, and permeated nitrogen mass were 201.6g/d, 212.4g/d, 208.8g/d and 188.4g/d at SRT of 20, 25, 30 and 40days, respectively. Thus, nitrogen compound was less outflowed at SRT of 40days. In the variation of C/N ratios of 4.5, 7 and 10, the nitrogen removal at C/N ratios of 7 and 10 was better than C/N 4.5, the denitrificated mass of C/N 7 and 10 was 409.2g/d and 439.2g/d respectively. Accordingly, permeated nitrogen mass were 202.8g/d, 58.8g/d and 28.8g/d at C/N ratios of 4.5, 7 and 10, respectively, thus nitrogen removal rates at C/N ratios of 7 and 10 were superior to C/N ratio of 4.5. The high COD loading led to the sufficient supply of the substrate for the denitrification. |
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| Key Words |
| intermittently aerated membrane bioreactor, SRT, C/N ratio, nitrogen mass balance |
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